This model is discontinued
AirTAC has phased out the MALJ series. You can still order this code here: we ship the direct replacement MBLJ20X400-50, with the same bore, stroke, output force, port and mounting, so it fits the same application. The MBLJ replacement upgrades to a riveted rolling-packed body and CMSG / DMSG / EMSG sensors (the MAL used CS1-M / DS1-M).
Airtac MALJ20 Adjustable Mini Cylinder MALJ20X400-50
The AirTAC Airtac MALJ20 Adjustable Mini Cylinder MALJ20X400-50 is a double-acting aluminum mini cylinder with a rear adjustable-stroke stopper: you can trim up to 50 mm, giving a usable end-position window from 350 to 400 mm. This model is discontinued — the direct replacement is the MBLJ20X400-50.
- BoreØ20 mm
- Stroke400 mm
- Adjust window350–400 mm
- Port sizeG1/8
- Rod threadM8×1.25
- StatusDiscontinued → MBLJ20X400-50
- No minimum order. A single piece can be ordered.
- Ready in 3–5 business days. That is the time we take to process the order and hand it to the carrier. Transit time after that depends on the destination.
About the Airtac MALJ20 Adjustable Mini Cylinder MALJ20X400-50
The AirTAC MALJ20X400-50 is a discontinued double-acting mini cylinder with a 400 mm stroke and a 50 mm rear adjuster, giving a usable end-position window of 350-400 mm. As a non-standard 400 mm stroke on a 20 mm bore, it was made-to-order beyond the 300 mm catalog maximum. The direct replacement is the MBLJ20X400-50, matching the bore, stroke, adjuster, and G1/8 port.
This SKU has no magnet and cannot take a position sensor. The rear adjuster is a travel stop, not a lock—it sets the end position but will not hold a load without live air. Impact is absorbed by a fixed rubber bumper. Upgrading to the MBLJ20X400-50 replaces the old threaded covers with a riveted rolling-packed body; if you ever need a sensor, the MBLJ uses CMSG/DMSG/EMSG switches rather than the legacy CS1-M/DS1-M family.
Airtac MALJ20 Adjustable Mini Cylinder MALJ20X400-50 Technical Specifications
| Model | Airtac MALJ20 Adjustable Mini Cylinder MALJ20X400-50 |
|---|---|
| Series | MALJ adjustable-stroke mini cylinder (discontinued) |
| Replacement | MBLJ20X400-50 |
| Bore size | Ø20 mm |
| Stroke | 400 mm |
| Adjustable window | 350 – 400 mm |
| Acting type | Double acting, adjustable stroke |
| Port size | G1/8 |
| Rod thread | M8×1.25 |
| Fluid | Air (filtered by 40µm element) |
|---|---|
| Operating pressure | 0.1 – 1.0 MPa |
| Proof pressure | 1.5 MPa |
| Temperature | -20 to +70 °C |
| Speed range | 30 – 800 mm/s |
| Cushion | Fixed rubber bumper |
| Max standard stroke | Up to 300 mm |
The rear adjuster is a travel stop, not a lock — it sets the end position but does not hold the load without live air. No back-cover code and no SDB on adjustable-stroke. The MBLJ20X400-50 carries the same ratings.
Theoretical Output Force (Ø20mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 132 N | 132 N |
| 0.7 MPa | 185 N | — |
| Max (@1.0 MPa) | 27 kgf | |
MALJ is double-rod: the rear rod that carries the stroke adjuster passes through the rear cover, so both piston faces lose rod area. Push is shown at the annular-area value (conservative), lower than a single-rod MAL push of the same bore. The MBLJ20X400-50 matches these values.
Model Code: Airtac MALJ20 Adjustable Mini Cylinder MALJ20X400-50
| MALJ | Adjustable-stroke aluminum mini cylinder, double acting (discontinued). |
|---|---|
| 20 | Bore size in mm (20/25/32/40). |
| ×400 | Nominal stroke length in mm. |
| -50 | Adjustable amount: trim the end to a 350–400 mm window. |
| S | Optional magnet for a CS1-M / DS1-M sensor (MBLJ uses CMSG/DMSG/EMSG). |
Replacement: MALJ → MBLJ. No back-cover (CA/U/CM) and no SDB. Mounting: FA / LB.
Where the Airtac MALJ20 Adjustable Mini Cylinder MALJ20X400-50 Is Used
PCB Edge Router Depth Stop
Dials the cutting head reach on a printed circuit board depaneling router.
Thin-Film Web Tensioning
Trims the dancer roller position on a packaging film unwind stand. The 50 mm rear stop adjusts the 400 mm extension precisely without swapping long-stroke hardware.
Carton Flap Folder
Sets the tucking arm end position on a case erector. The fixed rubber bumper absorbs the impact of the 8 mm rod at speed, protecting the folding mechanics.
Replacing the Airtac MALJ20 Adjustable Mini Cylinder MALJ20X400-50 with MBLJ20X400-50
To replace this MALJ20X400-50, order the MBLJ20X400-50. Confirm the 20 mm bore, 400 mm stroke, 50 mm adjust code, G1/8 PT port, and FA or LB mounting (there is no back cover or SDB option). Because this is a non-standard 400 mm stroke on an 8 mm rod, be aware of rod-bending and side-load risks on long extensions. The adjuster is a stop, not a lock; add an external locking device if you need to hold a load without air.
Note that 400 mm exceeds the 20 mm bore's 300 mm standard maximum, so this remains a special-order dimension.
Upgrade checklist
- ✓ Order the MBLJ20X400-50 (same bore/stroke/adjust)
- ✓ Same 350–400 mm adjustable window
- ✓ Adjuster is a stop, not a lock
- ✓ No back cover / SDB — plan an FA/LB mount
- ✓ Sensor: swap CS1-M/DS1-M → CMSG/DMSG/EMSG
Installation & Maintenance Notes
- check Use clean air filtered to 40µm or finer.
- check Keep within 0.1 – 1.0 MPa operating pressure.
- check The rear adjuster sets the end position — it is not a load lock.
- check No back-cover / SDB on adjustable-stroke — use FA / LB.
- check Front/rear covers are threaded — not for field disassembly.
- check For new builds, specify the MBLJ20X400-50 instead of this discontinued model.
Airtac MALJ20 Adjustable Mini Cylinder MALJ20X400-50 FAQ
Yes, the MALJ20X400-50 is discontinued. The direct replacement is the MBLJ20X400-50, which matches the 20 mm bore, 400 mm stroke, 50 mm adjuster, and G1/8 port. The MBLJ upgrades the construction to a riveted rolling-packed body instead of threaded covers.
At 0.5 MPa it pushes 157 N and pulls 132 N; at 0.7 MPa it pushes 220 N, with a maximum force of 32 kgf at 1.0 MPa. The 50 mm adjuster is a travel stop that shortens the stroke, creating a usable 350-400 mm window. It does not hold the load without air. This SKU lacks a magnet, so it cannot accept a position sensor.
Authorized Export Seller
Genuine AirTAC parts produced by AirTAC factory.
Direct Upgrade
The MBLJ20X400-50 replaces this model 1:1.
Fast Dispatch
MBLJ replacements are processed and dispatched in 3-5 business days.
Fast Reply
Most inquiries answered within 7-8 hours.
Recommended AirTAC MBLJ Replacements
Request a Quote (Airtac MALJ20 Adjustable Mini Cylinder MALJ20X400-50 → MBLJ20X400-50)
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